Rotary jar



Aug. 4, 1925.

J. A. KAMMERDINER ROTARY JAR Filed Dec. 16 1924 BYWMM 77% A TTORNEYS.

I assisting in .dislodging tools, equipment, or

Patented Aug. a, i l I i i ti im t ATEN ll @FFHQE.

* mains A. nannnnmunn, or Los Andean-s; CALIFORNIA.

noranyann. I

Application filed December 16, 1924. Serial No. 756,208. To all whom it may concern: threads may be closed at one edge by fil- Be it known that I, JAMns ALLEN KAM- lets 11. MERDINER, 'a citizen ot the United States, Dlsposed within the cage is a hammer and resident of Los Angeles, in the county comprising an annular hammer, head 12 of Los Angeles', State of Calitornia,have adapted to engage the anvil 13 tor-med on invented new and useful Improvements in a the plug 8. The hammer head is provided Rotary Jar, of which the following is a with a tubular shank 14 which slidably exspecification. tends through an opening in plug 8 and is,

" This. invention relates to a rotary jar-tor provided at the lower end with a pin 15 for attachment in the string of pipe. The shank like devices which have become stuck in is extended above the head as indicated by holes, such as oil well holes. The present 16 andls provided with threads 17 wire invention pertains broadly to that class of sponding to the threads on the cage. The

devices disclosed in Reissue Letters Patent .shank is extended upwardly to torma tubu- No. 15,760, February 12,1924, wherein an lar plunger 18 slidingly mounted in the appliance is described for use in hydraulic chamber 9. At the upper end of the plunger rotary drilling of wells. In such a device a are cup leathers 19. It is obvious that a circulation of water or mud must bemaincontlnuousclosed passage is formed from I tained in the hole, and, to this end, a jar is the pin 6 through the body to the pin 15.

provided whichmay be lnterposed 1n the This construction provides for connecting circulationline and form a part thereof. the tool in circulation line.

The present invention contemplates use of p The. ar s placed in a string of tubing or a chamber in the jar to house the .tllp plpe, a fishlng tool depending from the botmechanism. The primary object of this intom of the string. Upon getting/a grip .80 I

vention is to provide a chamber of the charupon the lost part or the device 0 be disacter described wherein the sum-total of the lodged, the jar is contracted by owerin space thereinis at all times the same regardthe string so that the segments of the three less of moving parts therein, thus,-permit on the hammer shank slide between the seg ting [complete closure. In devices of this ments of the thread on the cage. The

character, if the-chamber is not so conthreads on the hammerv and cage registerstructed, mud, grit, and water may enter, ing, the cage isrotated so that the threads wearing, the parts and actingv as a check mesh, a quarter turn being suficient. The- I upon the blows delivered on tripping the fillets prevent the hammer from riding out I 'ar, V I y i of mesh with the cage threads, and 'further- W An embodiment of the invention is illusmore, in this position, continuous rotation trated in. the accompanying drawing, in of the string may be eiiected, In the action which: g v of the hammer head 12 being moved from Fig. 1 is an axial sectionthrough the jar contracted to expanded position, the plungin, contracted condition, part being shown in or 9 will recede into the plunger chamber, elevation; Fig. 2 jsanother axial section whereas, the shank 14: of equal size will be showing the jar-inexpanded position; Fig. intruded into the chamber 7 Thus, the 3 is a section on the line 3-3 of Fig. 2; and total recession of plunger 18 is exactly equal Fima is a section asseen on the line -A: to the intrusion of shank 14: and the sumot l ig. 2.. 1 mation of the displacement is equal. It is Referring more particularly to the drawobvious that movement of the hammer head ing, 5 indicates a cylindrical body or cage 12 downwardly will cause no diflerence in having a threaded tapered pin 6 at the upper the volume total of space within the chamend. The bore 7 is threaded at the lower her as the enlargement on one side of the .end to receive a plug 8. The upper end of hammer head is compensated for by the the bore is reduced in diameter to form a reduction on the other side. Having placed plunger chamber 9. Within the bore is a the threads in mesh a pull is exerted upon mutilated thread 10 formed of two diametrithe string, and, after the proper tension cally opposed portions occupying eaclraphas been reached, the ar is turned or ro-. proximately one-quarterof the periphery. tated. Rotation of the two parts causes These threads form'in eflec't shoulders which segments of the threads to ride out of mesh are inclined to the axis of the tool. The and trip, whereupon the'fhammer strikes the mer there is substantially no resistance due to their position in the'plunger'chamber.

. Upon the upward movement of the hammen head, the cup leathersexpand and prevent any liquid from entering the trip chamber.

' lVhat I claim is:

1. A rotary jar adapted to be connected in a string of pipe comprising a cage having .a trip chamber closed at the lower end:

and provided with an anvil for impact of a hammer thereon, a tubular reciprocable hammer having a hammer head mounted in said chamber and slidably extending through the lower end of said chainber,.a plunger chambercommunicating with and at the upper end of said trip chamber, the

upper end of said hammer being slidably mounted in said plunger chamber, said plunger chamber being adapted to communicate with'said string, trip means on said hammer and said cage to-arrest the movement of said hammer intermediate the ends of said trip chamber and to hold said cage and hammer under tension in this position, said trip means being arranged to be released by relative rotation of said cage and hammer and to freely permit said hammer to slide longitudinally insaid cagewhereby said head may be arrested by impact on said anvil.

2. A rotary jar adapted to be connected in a string of pipe comprising a cage having a trip chamber closed at the lower end and provided with an anvil for the impact of a hammer thereon, a tubular reciprocable hammer having a hammer head mounted in said chamber and slidably extending through the lower end of said cage, a plunger chamber communicating with and at the upper end of said tripchamber, the upper end of said hammer being slidably mounted in said plunger chamber, said plunger chamber being adapted to communicate with said string,- trip means on said hammer and said cage to arrest the movement of-said hammer intermediate the ends of-said trip chamber andto hold said cage and hammer unden tension in this position, said trip means bemg arran edto be releasedby relative rotation of said cage and hammer and to freely. permit said hammer to slide longitudinally 1n said cage whereby said" head maybe arrested by impact-on said.anviland..cup leathers onthe plunger portion of i'said hammer with the trip chamber.

leather dished away from said 3. A rotary jar adapted. to be connected in a string of pipe comprising a cage having a cylindrical trip chamber closed at the lower end and provided with an anvil for impact of a hammer thereon, a cylindrical hollow reciprocable hammer rod having a. hammer head mounted in said chamber intermediate its ends and slidably extending through. the lower end of said cage, a plung er chamber communicating with' and located at the upper-end of said trip chamber, the upper end of said-hammer rod being slidably mounted in said. plunger chamber, said plunger chamber being adapted to communicate with said string, trip means on said hammer and, said cage to arrest the movement of said hammer intermediate the ends of said'trip hammer and to hold said released by relative rotation of said cage and hammer and to freely'permit said hammer to slide longitudinally in said cage cage and hammer under tension in this p0 s1t1on,-sa1d trip meansbeing arranged. to be whereby said head may be arrested by impact on said anvil. I i. A rotary jar adapted to be connected in a string of pipe" comprising a cagehaving a cylindrical trip chamber closed. at the lower. end and provided with an anvil for impact of a hammer'thereon, a cylindrical hollowreciprocable hammer rod having a hammer head mountedin said chamber in through the lower'end of saidcage, a plunger chamber communicating withj and -lotermediate its en-ds'and slidably extending 'cated at the upper end of said trip chamber,

the u per endfof said hammer rod being slidab y mounted in saidplunger chamber,

said plunger chamber being adapted to communicate with said string-trip means on said hammer and said chamber to'arrest the movement of said hammer intermediate the ends of said trip chamber and to hold said cage and hammer under tension invposition,

said; trip meansbeing arranged to hereleased by relative rotation of said cage and hammer and to freely permit said hammer to slide longitudinally in said cage whereby said head may be arrested by impact on said anvil, and cup'leathers onthe plunger portion of said hammer with the leathers dished away from said trip chamber.

5. ,A rotary jar 'comprisinga cage having an anvil at the bottom thereof, a hammer s'lidably mounted therein for axial movement, said hammer having a cylindrical hollow rod with a head intermediate the ends thereof so that when ex anded said head may engage said anvil, trip means to arrest the movement of said hammer above said anvil and to take the tensile .strain characterized by said trip means comprising oppositely' disposed mutilated thread sections onsaid cage and corresponding segments on'said shank, said cage being provided at its upper end with a plunger chamber in which the upper end of said hammer rod slidably' extends and being of the same diameter as theportion of the hammer rod' extending through the bottom of said-cage.

'6. A rotary jar comprising a cage having an anvil at the bottom thereof and a hammer chamber therein, a hammer slidably mounted therein for axial movement, said hammer fcomprising a cylindrical hollow.

hammer rod having a head intermediate its endsyso tha-tfswhen expanded-said head may engage said- T anvi1 trip means to arrest movement of'sai-d hammer above said anvil and to take tensile strain characterized by saidtrip means comprising oppositely dis.-

posed mutilated thread sections on said cage and corresponding segments on, said shank, said cage having a. plunger chamber at its upper end with said trip chamber, the upper end of said hammer rod-being slidably mounted in said plunger chamber, said plunger chamber being adapted to communihave hereunto subscribed my name this 3rd day'of December, 1924.

JAMES AKAMMEBDINER. 

